﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace chap10 {
    public class SimpleMath {
        public int Add(int x, int y) {
            return x + y;
        }

        public int Subtract(int x, int y) {
            return x - y;
        }

        public int SquareNumber(int a) {
            return a*a;
        }
    }
}